Question

My friend recently proved 0=1 and i know something is wrong but i dont know what

Answer 1

√a × √b = √ab

only if at atleast one among a,b is positive

here both a,b is non negative so not possible

Answer 2

Explanation:

Remember when expanding radicals,

`√(ab) = √(a) * √(b)`

When expanding radicals into two radicals, we don't let our radicand have two negative answers.

`i = √( - 1)`

`{i}^(2) = - 1`

We don't do this

`(√( - 1) ) {}^(2) = √( - 1 * - 1)`

`- 1 = √(1)`

`- 1 = 1`